CN100416963C - Electric apparatus, especially electric machine - Google Patents
Electric apparatus, especially electric machine Download PDFInfo
- Publication number
- CN100416963C CN100416963C CNB2004100869437A CN200410086943A CN100416963C CN 100416963 C CN100416963 C CN 100416963C CN B2004100869437 A CNB2004100869437 A CN B2004100869437A CN 200410086943 A CN200410086943 A CN 200410086943A CN 100416963 C CN100416963 C CN 100416963C
- Authority
- CN
- China
- Prior art keywords
- temperature
- motor
- safeties
- power supply
- temperature sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 238000004804 winding Methods 0.000 claims description 16
- 230000005611 electricity Effects 0.000 claims description 9
- 230000033228 biological regulation Effects 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000010304 firing Methods 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002277 temperature effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
- H02H7/0852—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load directly responsive to abnormal temperature by using a temperature sensor
Landscapes
- Protection Of Generators And Motors (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
The present invention describes an electric device (3), in particular a motor, having a shell (7), a device (9, 10) installed in the shell (7) for generating heat, a bearing (8) heat conducting and connecting with the device (9, 10), a safety device for cutting off power supply when the temperature is higher. Try to shut down reliably without limiting the running of the device needlessly. Thus, according to the present invention, the safety device has a plurality of temperature sensors (14 to 16), wherein at least one sensor is installed on the device (9, 10) and at least one is installed on the bearing (8), the safety device also has an analysis device (11) which synthesizes temperature information solved by the temperature sensor (14 to 16) into a combined value, and compares it with a presetting value.
Description
Technical field
The present invention relates to a kind of electric device, particularly a kind of motor has a shell, a device that is installed in the generation heat in the described shell, a bearing and safeties that are connected with the described device that produces heat, described safeties are cut off the electricity supply under the situation of excessive temperature.
Background technology
In order to simplify the following description, in conjunction with a kind of motor explanation the present invention.Similar problem also comes across other electric device, the transformer or the electronic circuit of the heating that for example wherein is in operation.
Under the situation of motor that explosion hazard is arranged and the application of other electric equipment, with a kind of temperature grade classification (for example T6, T5 or T4).Corresponding temperature grade depends on have the firing temperature of which type of combustible material and this combustible material what are in the environment of described device.Specify the maximum surface temperature of a described device for each temperature grade.In other words, people will manage to make the external temperature of shell always to keep the inflammable articles in the environment of low auto levelizer can not light a fire.Such igniting can cause blast under certain situation.
People believed originally, used such device will observe the supplier's of device regulation, surpassed the limit that is allowed to avoid surface temperature.For example motor is merely able to move under predetermined load and must turn-off forcibly when being blocked.Yet the fact shows, can not believe that the user is corresponding to described regulation rotating device.Therefore must exist a kind of assurance can not surpass the maximum surface temperature protection mechanism in the device itself.
A kind of known scheme is now, and the size of handle assembly is done to such an extent that can not surpass the necessarily predetermined degree of ambient temperature to making for the maximum heat conduction on surface is little to temperature when normally moving greatly.Specify with temperature grade in this ambient temperature.Must limit ambient temperature like this, and described shell usually is provided with fin.Yet the shortcoming of An Paiing is like this, will do to such an extent that size is very big significantly for the device of most purposes, thereby and too expensive.
Another scheme commonly used is to adopt a kind of heat portective switch, for example bimetal release in the zone of the device that produces heat.At the generation thermal region described in the electro-motor generally is stator winding.Yet this switch must have the low temperature extremes of irrespectively turn-offing in early days with ambient temperature that arrives, and makes the surface temperature overshoot of having no progeny in the pass be no more than the temperature extremes of permission.It is satisfied fully that this scheme neither be made us, because winding is warmmer than the surface of shell significantly when normal operation.If motor shutdown, the heat in whole motor cause the surface temperature of shell to rise to temperature equalization appears and till.In practice, this means that the maximum permissible temperature of winding must not surpass the maximum permissible temperature on shell surface.If ambient temperature is just high as the shell surface temperature that allows, such device does not just allow starting.This result under general situation is with regard to shutoff device, promptly to cut off the electricity supply before the shell surface temperature that reaches permission.Therefore can not use described electric device ideally.
Summary of the invention
Task of the present invention is to make it possible to turn-off reliably, and not without the operation of restraint device necessarily.
This task is finished in this wise by technology as described in the preamble: described safeties have a plurality of temperature sensors, wherein at least one is arranged on the device that produces heat and at least one is arranged on the bearing, and in having an analytical equipment, described analytical equipment comprehensively becomes a combined value to the temperature information of obtaining by temperature sensor, and this combined value and a preset value are compared.
The invention provides a kind of electric device, have a shell, a device that is installed in the generation heat in the described shell, a bearing and safeties that are connected with the described device heat conduction that produces heat, described safeties are cut off the electricity supply under the situation of excessive temperature, it is characterized in that, described safeties have a plurality of temperature sensors, wherein at least one is arranged on the device that produces heat and at least one is arranged on the bearing, and has an analytical equipment, the temperature information that described analytical equipment handle is measured by temperature sensor comprehensively becomes the combined value of a weighting, and this combined value and a preset value are compared.
Not only can obtain temperature in the hottest zone in service with this arrangement, just produce the temperature in the device of heat.Additionally can also measure the temperature of bearing at least, bearing is in operation and itself does not produce heat, but owing to also can improve temperature from the heat conduction that produces hot device.Generally speaking, the be in operation device that produces heat has temperature far above bearing.That is to say that therefore bearing can draw certain heat from the device that produces heat after cutting off the electricity supply.Carry out a kind of temperature equalization in this heat is transmitted, wherein the temperature of bearing and shell rises, and the temperature of the device of generation heat descends.Because can know by the bearing temperature, can when safeties move, can consider this thermal storage device and, just cut off the electricity supply when being no more than simultaneously the maximum permissible temperature of shell as long as the shell under bearing and certain situation can not be drawn the heat that the device that produces heat sends.Can indicate that based on the information that is provided the end comes on certain degree, and only when the running status of determining of dangerous situation can appear in subsequently temperature equalization during at power cutoff by the time, just cut off the electricity supply.
Preferably analytical equipment constitutes a kind of combined value of weighting.The temperature effect of each parts of handle assembly joins in the combined value with different weights.Thereby this fact of consideration that can be such, described bearing for example can be bigger foundry goods, than winding much bigger thermal capacity is arranged.The temperature that produces the device of heat when thermal balance descends more much bigger than the temperature rising of bearing.Should be noted that at this " bearing should be called a zone that is connected with the device heat conduction that produces heat of device to notion.Therefore usually this also plays function of carrying and support to the device that produces heat.But this is dispensable to the present invention.
Preferably described temperature sensor adopts the temperature dependence electric component that the tool positive temperature coefficient is arranged to constitute.Such electric component for example can be the PTC resistor, and its resistance rises along with temperature and increases.Yet also can use the semiconductor device that changes its current/voltage relation according to ambient temperature.
At this preferably, temperature sensor constitutes an electrical network.For example they can be connected in series.Particularly when adopting the PTC resistor, obtain a kind of very simple circuit arrangement thus, wherein can be according to the voltage drop on the element of series circuit with simple mode combination temp information.When constituting weighted value also is like this.Each temperature sensor has different meanings in series circuit in the case.Correspondingly also be applicable to parallel circuits.
Preferably safeties have a kind of reference element, and the switching device action during corresponding to the respective amount on the temperature sensor network of the predetermined electrical amount on reference element.If for example temperature sensor constitutes with the PTC resistor, switching device action when the reference resistance device has identical resistance.Corresponding monitoring can be carried out by means of a comparator in electronic circuit easily.
Preferably the temperature sensor on the device that produces heat has a kind of first temperature dependence, and the temperature sensor on bearing has a kind of second temperature dependence.For example, another temperature sensor just constitutes the Pt-1000 resistor if temperature sensor constitutes the Pt-100 resistor.This is a kind of straightforward procedure of temperature effect of correspondingly weighting respective element.Each temperature sensor is selected according to the thermal capacity and the desired temperature range of its position, the parts of being monitored.Can select other combination, such as Pt-200/Pt-500 or Pt-200/Pt-400.
Preferably described safeties have the voltage accessory power supply different with power supply.Thereby the operation safeties are no longer dependent on power supply.For example direct voltage can be arranged in safeties is the power supply of 24V, and the power supply of electric device usually has higher voltage, for example the 220V alternating voltage.
Preferably, safeties have the switch of an electrically actuatable, accessory power supply open circuit when being out of order, and cut off motor power.Provide certain reliability under this situation for fault.Break down with power supply and irrespectively to close electric device, when the people can not determine, safeties worked.
It also is favourable that safeties have a locking device, and the described power supply that is cutting off at locking device only could insert the power supply of motor later on again under the operation of regulation.The starting point of doing like this is, when cutting off the electricity supply based on the combination of device temperature inside, exist successfully cut off the electricity supply after the excessive danger of surface temperature.If the people directly recloses power supply behind deenergization, will produce such situation again, because shell temperature inside relation does not change at this moment.Certain measure correspondingly is provided, waits for to force the user.Such measure for example can be to send closes the accessory power supply regular hour, for example is longer than the locking of the device that can unlock for 5 seconds.
Has a resetting means at this preferably described locking device.Can comprise above-mentioned shutoff accessory power supply at this.Can certainly imagine other reset position.
The device that preferably produces heat constitutes winding, and bearing constitutes the stator of motor.This is the situation that the temperature of highland raising device appearred in a kind of wherein disadvantageous motor operation condition.
This preferred the application is that motor is connected with the pump of the apply device of feeding, and motor, pump and operating means constitute an assembly.The assembly of this part is called " power assembly (powerpack) ".Described assembly for example is used in the ship with valve, valve or the analog of operation away from the order bridge.In such power assembly, only need deliver to corresponding valve to electrical power.Additionally must the operation motor.Described valve just can or have been closed with hydraulic open.If yet just in such purposes, exist valve to block or the overheated risk of motor when otherwise blocked.Present described safeties can allow such " power assembly " also can be used on the oil tanker.
Description of drawings
Explain the present invention by means of a preferred embodiment with reference to the accompanying drawings.In the accompanying drawings:
Fig. 1 is a schematic diagram that constitutes the electric device of motor,
Fig. 2 is the schematic diagram of a circuit,
Fig. 3 is with " power assembly " shown in the schematic diagram.
Embodiment
Fig. 3 illustrates " power assembly " 1, and for example apply device 6 of a piston-cylinder tube unit form of a motor 3, jar 5 and wherein is installed in a public shell 2.Motor 3 mechanically is connected with pump 4.Pump 4 is the operating means supplying energy.When operation during motor 3, operating means 6 is operated and driven to described pump, thereby hydraulically be operatively connected the assembly on operating means 6, and valve does not for example need from the space at a distance the position to arrange hydraulic line to operating means.Such " power assembly " is for example used aboard ship.This this described " power assembly " can be far with the centre distance of issuing an order, and on-the-spotly handle a valve opening and closing, do not need to be provided with the fluid pressure line of corresponding length.
If operating means 6 is blocked now, motor can not driving pump 4.If so still motor 3 is continued power supply, temperature will rise.Thereby the surface temperature of shell 2 also can rise.Be placed in the inflammable gas as shell 2, this can cause dangerous situation.Such inflammable gas for example can be a gasoline vapor, surpasses a predetermined value as the temperature of shell 2, i.e. firing temperature, and gasoline vapor just may detonate.
For fear of such situation, various elements are set in motor 3, these elements explain below with reference to Fig. 1 and Fig. 3.
The motor 3 that only schematically illustrates in Fig. 1 has a shell 7, and the stator 8 that only schematically illustrates wherein has been installed.Stator 8 has two windings 9,10 by a supply unit 11 (Fig. 2) voltage supplied.For example, described power supply staggers for two electric mutual 90 °, and to produce a rotating magnetic field in winding 9,10, described rotating magnetic field acts on the rotor that is not shown specifically.Plural winding can certainly be set.
At this moment be in operation produces certain loss heat in the winding 9,10, and the temperature that described loss thermal conductance causes winding 9,10 rises, thereby the temperature of stator 8 also rises.A kind of heat conduction is also carried out on shell 7, similarly improves its temperature.When running well, limited in shell 7 lip-deep temperature, thus when the motor operate as normal, there is not the surface temperature of shell 7 to reach the danger of predetermined temperature, described predetermined temperature is the firing temperature of the flammable mixture that exists in the environment of motor 3.
Yet at this moment under disadvantageous situation, for example under the situation that motor is blocked, loss heat occurs and improve.There is not this loss heat of addition thereto to bring up to the degree that explosion hazard occurs to the lip-deep temperature of shell 7.
Rise in order to measure such temperature in time, on each winding head 12,13 of 9,10 of winding, a temperature sensor that constitutes PTC resistance 14,15 is installed, just a kind of pure Ohmic resistance, its resistance depends on temperature.Because winding 9,10 produces heat under existing situation, described also they being called, produce hot device.PTC resistor 14,15 just directly measures the temperature sensor of the temperature on the device that produces heat.Can certainly replace such PTC resistor with other temperature sensor.
The temperature sensor that another constitutes PTC resistor 16 additionally is set in stator 8, and described PTC resistor 16 heat conduction ground is connected with stator case 7.For example PTC resistor 16 is enclosed in the hole of stator case.
Two the PFC resistors 14,15 that are arranged on the winding head 12,13 constitute the Pt100 resistor.PTC resistor 16 in the stator 8 constitutes the Pt-1000 resistor.Just it has steeper characteristic curve.In other words, PTC resistor 16 increases manyly than PTC resistor 14,15 resistance values when identical temperature rises.
These three PTC resistor 14-16 as can be seen from Fig. 2, are connected in series, and lead to an input of comparator 17.Another input of comparator 17 _ reference resistance 18 of connection.No matter be that the series circuit that is made of PTC resistor 14-16 or reference resistance 18 are all by a boost voltage U
AIn the power supply, power supply for example is the direct voltage of 24V.
Comparator 17 is connected with the supply unit 11 of powering for motor 3.Supply voltage U of supply unit 11 usefulness
MPower supply, for example alternating current of 220V.
A relay 19 schematically is shown in supply unit 11, if comparator 17 determines that the resistance of three PTC resistor 14-16 that are connected in series is suitable with the resistance of reference resistance device 18, described relay 19 is opened a way, thereby and closes motor 3.This is a kind of situation that wherein is lower than the maximum permissible temperature of motor 3 in the surface temperature of shell 7 with for example 3 ℃ guard track.
By in the zones of different that also has different thermal capacity of motor 3, using three PTC resistor 14-16, can obtain the estimation preferably of the total amount of heat in the motor.When the heavy foundry goods shell of shell 7 usefulness of motor constituted, it had much bigger thermal capacity to winding.Thereby draw the maximum surface temperature of motor 3 in the total amount of heat of time point in motor 3 of power cutoff, however the maximum surface temperature of described motor 3 only power cutoff some the time after just reach.
Thereby the electronic circuit that schematically illustrates in Figure 21 constitutes a temperature monitoring, described temperature monitoring is demarcated, when resistance value 18 is just turn-offed motor 3 when suitable corresponding to the PTC resistor 14-16 of series connection, the temperature on shell 7 surfaces is for example in the surface temperature that allows below 3 ℃ in the case.
Relay 19 constitutes normally opened relay, as boost voltage U
AThereby its open circuit and shutoff motor 3 during decline.
Be not illustrated in detail in and be provided with a locking device in the circuit that is constituted as safeties 21, the effect of described locking device is, if because too high temperature has been turn-offed after the motor 3, can not automatically reclose motor 3.But must turn-off accessory power supply U
AMore than 5 seconds, just can reset motor 3.Can also carry out hand-reset, for example reset by button 20.
Before motor 3 puts into operation, should wait for that certainly a regular hour descends to carry out sufficient temperature.Otherwise under the certain condition when switching on again motor 3 same malfunction appears.
Can under all the other all identical conditions, can utilize motor 3 with described scheme, and surface temperature reaches near the maximum permissible temperature limit than so far more much betterly, yet in any case all under it.
Claims (11)
1. electric device, have a shell, a device that is installed in the generation heat in the described shell, a bearing and safeties that are connected with the described device heat conduction that produces heat, described safeties are cut off the electricity supply under the situation of excessive temperature, it is characterized in that, described safeties have a plurality of temperature sensors (14-16), wherein at least one is arranged at the device (9 that produces heat, 10) go up and at least one is arranged on the bearing (8), and has an analytical equipment (11), described analytical equipment (11) is the comprehensive combined value that becomes a weighting of the temperature information of being measured by temperature sensor (14-16), and this combined value and a preset value are compared.
2. device as claimed in claim 1 is characterized in that, described temperature sensor (14-16) is constructed to the temperature dependence electric component of positive temperature coefficient.
3. device as claimed in claim 2 is characterized in that, temperature sensor (14-16) constitutes an electrical network.
4. device as claimed in claim 3, it is characterized in that, safeties (21) have a kind of reference element, and switching device (19) action during corresponding to the respective amount on temperature sensor (14-16) network of the predetermined electrical amount on reference element (18).
5. device as claimed in claim 1 is characterized in that, the temperature sensor (14-16) on the device (9,10) that produces heat has a kind of first temperature dependence, and the temperature sensor (16) on bearing (8) has a kind of second temperature dependence.
6. device as claimed in claim 1 is characterized in that, described safeties (21) have the accessory power supply (U with the different voltages of power supply
A).
7. device as claimed in claim 6 is characterized in that, safeties (21) have the switch (19) of an electrically actuatable, accessory power supply (U when being out of order
A) open circuit, and the power supply of cut-out motor (3).
8. device as claimed in claim 1 is characterized in that, described safeties (21) have a locking device, cuts off the later power supply that only could insert motor (3) under the operation of regulation again of power supply of motor (3) at described locking device.
9. device as claimed in claim 8 is characterized in that, described locking device has a resetting means (20).
10. device as claimed in claim 1 is characterized in that, the device (9,10) that produces heat is constituted as winding, and bearing (8) is constituted as the stator of motor (3).
11. device as claimed in claim 10 is characterized in that, described motor (3) is connected with a pump (4) of presenting to apply device (6), and motor (3), pump (4) and operating means (6) constitute an assembly (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10348789A DE10348789B4 (en) | 2003-10-21 | 2003-10-21 | Electric device, in particular electric machine |
| DE10348789.1 | 2003-10-21 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1610205A CN1610205A (en) | 2005-04-27 |
| CN100416963C true CN100416963C (en) | 2008-09-03 |
Family
ID=34529687
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100869437A Expired - Fee Related CN100416963C (en) | 2003-10-21 | 2004-10-20 | Electric apparatus, especially electric machine |
Country Status (4)
| Country | Link |
|---|---|
| KR (1) | KR100673335B1 (en) |
| CN (1) | CN100416963C (en) |
| DE (1) | DE10348789B4 (en) |
| IT (1) | ITTO20040725A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101197139B1 (en) | 2012-03-28 | 2012-11-08 | 이텍산업 주식회사 | System for enhancing of snow removal object of snow plow |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267123A (en) * | 1999-03-12 | 2000-09-20 | 尹顿公司 | Thermal compensation controller for starter of motor |
| CN1376902A (en) * | 2001-02-01 | 2002-10-30 | 佳能株式会社 | Abnormality detecting method and protector |
| JP2003153432A (en) * | 2001-11-15 | 2003-05-23 | Alpine Electronics Inc | Thermal protection control device for electric/ electronic part |
| CN2634696Y (en) * | 2003-06-30 | 2004-08-18 | 金彦辉 | Automatic protector for overheat of draught fan motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19832558B4 (en) * | 1998-07-20 | 2005-10-06 | Infineon Technologies Ag | Semiconductor arrangement with at least one semiconductor chip |
-
2003
- 2003-10-21 DE DE10348789A patent/DE10348789B4/en not_active Expired - Fee Related
-
2004
- 2004-10-19 KR KR1020040083628A patent/KR100673335B1/en not_active Expired - Fee Related
- 2004-10-19 IT IT000725A patent/ITTO20040725A1/en unknown
- 2004-10-20 CN CNB2004100869437A patent/CN100416963C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267123A (en) * | 1999-03-12 | 2000-09-20 | 尹顿公司 | Thermal compensation controller for starter of motor |
| CN1376902A (en) * | 2001-02-01 | 2002-10-30 | 佳能株式会社 | Abnormality detecting method and protector |
| JP2003153432A (en) * | 2001-11-15 | 2003-05-23 | Alpine Electronics Inc | Thermal protection control device for electric/ electronic part |
| CN2634696Y (en) * | 2003-06-30 | 2004-08-18 | 金彦辉 | Automatic protector for overheat of draught fan motor |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20050038557A (en) | 2005-04-27 |
| KR100673335B1 (en) | 2007-01-24 |
| DE10348789B4 (en) | 2006-03-09 |
| ITTO20040725A1 (en) | 2005-01-19 |
| DE10348789A1 (en) | 2005-06-02 |
| CN1610205A (en) | 2005-04-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6760207B2 (en) | Compressor terminal fault interruption method and apparatus | |
| CN1083561C (en) | Control circuit for a refrigerating system | |
| US6542062B1 (en) | Overload protector with control element | |
| US8427099B2 (en) | Monitor for charging series connected batteries | |
| CA2985064A1 (en) | System and method for protecting a solid-state power controller | |
| US9478971B2 (en) | Power cord apparatus for remotely detecting excessive operational parameters in an electrically powered machine | |
| MXPA06014887A (en) | Safety lug suitable for the connection to a current outlet . | |
| EP2621043B1 (en) | Current Limiter | |
| JP7004801B2 (en) | Air conditioner | |
| US10388802B2 (en) | System and method for synchronized rapid shutdown of electrical devices | |
| CN110341650A (en) | A kind of defroster protection circuit and defroster | |
| CN100416963C (en) | Electric apparatus, especially electric machine | |
| EP1158641B1 (en) | Sealed compressor with temperature feedback to motor protector unit | |
| JP2005240596A (en) | Protective device for electric compressor | |
| CN1219416C (en) | Water heater with proportional band temp. control for improved thermal efficiency | |
| JP4943134B2 (en) | Electric floor heating panel and electric floor heating device using the same | |
| JP4660490B2 (en) | Load tap changer | |
| CN204163909U (en) | For fuel heating system and the vehicle thereof of vehicle | |
| CN219415221U (en) | Electric heater | |
| JP2003274683A (en) | Protecting apparatus of motor | |
| EP3291638A1 (en) | Heated ptc element with protection circuit | |
| JP4241755B2 (en) | Electric motor protection device | |
| CN116365468A (en) | Temperature control protection circuit, heating equipment and energy storage air conditioner | |
| CN104011480B (en) | The method and apparatus for controlling resistance integrality | |
| JP3813505B2 (en) | Electric motor protection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080903 Termination date: 20211020 |